| 摘要 |
<p>PURPOSE:To prevent the extreme increase of the signal connection lines by providing an abnormality detecting circuit to output an abnormality informing signal when no coincidence of outputs is obtained between the 1st and 2nd comparators and then monitoring properly the output signal. CONSTITUTION:An output signal monitoring circuit 41 monitors the level of an output signal supplied to a control circuit 43 from an output circuit 42. A 1st comparator 103 is provided into the circuit 41 to compare the level of the output signal with the 1st reference voltage V1. A 2nd comparator 104 is also provided into the circuit 41 to compare the level of the output signal with the 2nd reference voltage V2. If no coincidence of outputs is obtained between both comparators 103 and 104, an abnormality detecting circuit 115 consisting of an AND gate 111, and OR gate 112, the X OR gates 113 and 114, and an AND gate 115 outputs an abnormality informing signal. In this case, both voltage levels V1 and V2 show the assured threshold upper and lower limit voltage levels of the circuit 43 respectively.</p> |
